Yeah, I have the same problem, I realized that about one month ago!
1981-05-09 and 04-09 are the same setlist; that's not a problem. The problem is that thay also are the same bootleg!!
I looked in a trader web and then I deleted 05-09, because the recording was an Ex SBD and there it said that 05-09 was a VG SBD, while 04-09 was an EX SBD...
I don't know, maybe you should leave both of them, Remy, until we know which has to be deleted...