Use VTOC (Volume Table of Contents) in FileAid 3.8 option.
Since you have said it is a GDG version, you can search using your base GDG name in the available volume serial numbers in MVS. You should know how many vol serials are available for your MVS environment.
If you mean it is a Generation of a Generation Data Group (Versions are possible, but rare), and you haven't mentioned how it got uncatalogued other than "So its uncataloged" can we assume it just "rolled off" the "end" when the maximum number of Generations were catalogued? It may be gone, for good.
You haven't mentioned whether the VOLUME is DASD or TAPE? If DASD, go with what diwz has suggested. If tape, talk to your tape management people. They probably have some historic data available, if not they should have periodic back-ups of the tape management system itself, where they may be able to get something.
Here is the JCL step that use FILEAID options to get volume serial numbers and datasets in the volume.
//STEP01 EXEC PGM=FILEAID
//SYSUDUMP DD SYSOUT=*
//SYSPRINT DD SYSOUT=*
//SYSLIST DD SYSOUT=*
//SYSTOTAL DD SYSOUT=*
//SYSIN DD *
$$DD01 VTOCDSN UNIT=3390,DSNAME=A056707.FILEAID.ZADD - searches and displays the file attributes under the specified UNIT.
$$DD01 VTOCDSN VOLSER=VZCE01,DSNAME=A056707.FILEAID.ZADD - searches and displays the file attributes under the specified VOLSER.
SYSOUT for $$DD01 VTOCDSN VOLSER=VZCE01,DSNAME=A056707.FILEAID.ZADD looks like below
27 FEB 2013 FILE-AID 9.2.0 PRINT FACILITY 04:20:11 PAGE 1
VTOC LIST FOR VOLUME VZCE01
VTOC: 1800 TRACKS ( 17 % USED) 74657 FREE DSCB'S 1 DATASETS
VOL: 150255 TRACKS ( 85 % USED) 15 TRACKS/CYLINDER 0 ALT TRKS
FREE: 1365 CYLINDERS ( 1052 MAX) 22135 TRKS 15780 MAX) 626 FREE XTNT
----- D A T A S E T N A M E -------------- ORG TRKS %USED XTS=
A056707.FILEAID.ZADD PS 15 0 1
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