M1 carbine magazine questions

[mwrookie]

I am helping my Aunt sort through some of my Grandpas things so I am starting with the M1 carbine magazines. I have read through most of the threads on this topic, however I m having a hard time trying to figure out exactly what I have. Not in the sense of who made them, but if they are USGI, Korean, ect. I am hoping you guys can give me a hand.

The following are magazines that I have that I am trying to get straight. So would I be correct with the following?
30rd split back that is stamped M2; not USGI, Knockoff, low value
30rd split back that is stamped SEY; USGI
30rd hard back that is stamped SEY; USGI

I am also sorting many 15rd some are AI, U, PMC, IA, I think RUGG, KC, SW and a few others. Im lucky that my Aunt is letting me keep a few. I can post pictures in the next day or so if that will help.

Thanks for all your help!

Information

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[jimb16]

You are likely correct on the 30s, although it is possible that the splitback SEY could be an aftermarket. Without seeing it we can't tell. The PMC is, I believe, a Plainfield Machine Co. mag.

[lambo35]

You might also note the 15 round GI magazines where the front fold/seam is to the right and those codes that fold to the left. This can be seen while looking down on the follower with the fold facing forward.

Chuck