Batch conditional FOR loop nested IF - batch-file

Question

I'm trying to write a script that parses a text file to identify removable drives by Label. The goal is to create a copy script based on the found drives.
I'm able to parse the file but I can't seem to get the second pair of IF conditions to be true.
I may be misunderstanding how variables are evaluated in each loop of the FOR.
Thoughts appreciated.
EDIT: Expanding on the original request for clarity(it was late when I asked) The expanded goal is to identify one or many target drives to copy data from an SD card. Since the drives letter allocations vary from PC to PC and depend on which is plugged in first my idea was to use the labels as somewhat identifiable values and create a simple copy string along the lines of
XCOPY SourceDrive\*.jpg DestinationDrive1\<GetDate>\
XCOPY SourceDrive\*.jpg DestinationDrive2\<GetDate>\
End Edit
#echo off
cls
title "Detecting device drive letters..."
setlocal enabledelayedexpansion
set DestinationDrive1Found=
set DestinationDrive2Found=
set SourceDriveFound=
set SourceDrive=
set DestinationDrive1=
set DestinationDrive2=
echo Detecting device drive letters...
echo list volume > %systemdrive%\ListDrives.tmp
diskpart /s %systemdrive%\ListDrives.tmp > %systemdrive%\CurrentDrives.tmp
echo Checking drive IDs
FOR /F "skip=7 tokens=2-4" %%a IN (%systemdrive%\CurrentDrives.tmp) DO (
set "matchvar=%%c"
set "comparevar=!matchvar:DRIVE=!"
IF /I NOT "!comparevar!" == "%%c" IF "!DestinationDrive1Found!" NEQ 1 (
echo Drive %%b was found to be %%c and will be DESTINATION1
set DestinationDrive1Found=1
set DestinationDrive1=%%b )
IF /I NOT "!comparevar!" == "%%c" IF "!DestinationDrive1Found!" EQU 1 ( echo Drive %%b was found to be %%c and will be DESTINATION2
set DestinationDrive2Found=1
set DestinationDrive2=%%b )
)
File I'm parsing
Microsoft DiskPart version 10.0.10586
Copyright (C) 1999-2013 Microsoft Corporation.
On computer: NEWGLOOMWIN10
Volume ### Ltr Label Fs Type Size Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 D DVD-ROM 0 B No Media
Volume 1 E Macintosh H HFS Partition 231 GB Healthy
Volume 2 C BOOTCAMP NTFS Partition 721 GB Healthy System
Volume 3 F TEAMXCAMRAX FAT Removable 1937 MB Healthy
Volume 4 G TEAMXDRIVEX NTFS Partition 465 GB Healthy
Volume 5 H TEAMYDRIVEY NTFS Partition 931 GB Healthy

Answer 1

Thanks to all who responded. Had #Mofi provided an answer I would have marked that response as the answer. In the end the removal of a four quote marks and the addition of an ELSE got me the answer I was looking for.
The script below gives me exactly what I'm after.
#echo off
cls
title "Detecting device drive letters..."
setlocal enabledelayedexpansion
set DestinationDrive1Found=
set DestinationDrive2Found=
set SourceDriveFound=
set SourceDrive=
set DestinationDrive1=
set DestinationDrive2=
echo Detecting device drive letters...
echo list volume > %systemdrive%\ListDrives.tmp
diskpart /s %systemdrive%\ListDrives.tmp > %systemdrive%\CurrentDrives.tmp
echo Checking drive IDs
FOR /F "skip=7 tokens=2-4" %%a IN (%systemdrive%\CurrentDrives.tmp) DO (
set "matchvar=%%c"
set "comparevar=!matchvar:CAMRA=!"
IF /I NOT "!comparevar!" == "%%c" (#echo Drive %%b was found to be %%c and will be SOURCE
set SourceDriveFound=1
set SourceDrive=%%b)
)
echo Checking drive IDs
FOR /F "skip=7 tokens=2-4" %%a IN (%systemdrive%\CurrentDrives.tmp) DO (
set "matchvar=%%c"
set "comparevar=!matchvar:DRIVE=!"
IF /I NOT "!comparevar!" == "%%c" IF !DestinationDrive1Found! NEQ 1 (
echo Drive %%b was found to be %%c and will be DESTINATION1
set DestinationDrive1Found=1
set DestinationDrive1=%%b
) ELSE (
IF /I NOT "!comparevar!" == "%%c" IF !DestinationDrive1Found! EQU 1 ( echo Drive %%b was found to be %%c and will be DESTINATION2
set DestinationDrive2Found=1
set DestinationDrive2=%%b ))
)

Answer 2

If you just want to set some variables to the drives allocated to any removable drive with the string DRIVE in it's 'label' then the following may provide you with an alternative not requiring elevation.
#Echo Off
For /F "UseBackQ Skip=1 Delims=" %%A In (`WMIC LogicalDisk Where^
"DriveType='2' And VolumeName Like '%%DRIVE%%'" Get Name`
) Do For /F %%B In ("%%A") Do Set/A "i+=1"&Call Set "_drv%%i%%=%%B"
Set _drv
Timeout -1
[Edits] - an example correctly stipulating a fixed drive
#Echo Off
For /F "UseBackQ Skip=1 Delims=" %%A In (`WMIC LogicalDisk Where^
"DriveType='3' And VolumeName Like '%%DRIVE%%'" Get Name`
) Do For /F %%B In ("%%A") Do Set/A "i+=1"&Call Set "_drv%%i%%=%%B"
Set _drv
Timeout -1
An example without stipulating the type of drive, (recommended based on comments).
#Echo Off
For /F "UseBackQ Skip=1 Delims=" %%A In (
`WMIC LogicalDisk Where "VolumeName Like '%%DRIVE%%'" Get Name`
) Do For /F %%B In ("%%A") Do Set/A "i+=1"&Call Set "_drv%%i%%=%%B"
Set _drv
Timeout -1