Pokemon Super Mystery Dungeon - Item Identifier Location

This password here contains a Plain Seed and it is a Thank You Mail
XQ5KP-% MM1-T1 YR$+F&Q
9NPXJJ8 C%&KY1 %58W&W$
0K%KW+4 0J8155 65PK3&N
PJ9F383 #W3419 FKN$65F

This password here contains a Decoy Seed and it is a Thank You Mail
XQ5KP-% MM1-T1 YR$+F&Q
9NPXJJ8 C%&KY1 %58W&W$
0K%KW+4 0J8155 65PK3&N
PJ9F383 #W3=16 FKN$65F

These two items are related to each other somehow in the games code and thus produce the same encryption key or so we think

This password here contains a Warp Seed and it is a Thank You Mail
21+W7C- M9KM=W $&T##9C
WM05=T& W8=Q+C =$TH23P
927YFN$ +478=M 8009H80
+6=&3$P HQFSM6 -MS%H-C

This password here contains a Ban Seed and it is a Thank You Mail
21+W7C- M9KM=W $&T##9C
WM05=T& W8=Q+C =$TH23P
927YFN$ +478=M 8009H80
+6=&3$P HQF+K9 -MS%H-C


So what we can deduce from just this small amount of information is exactly where the Items identifier value is stored in the password
XXXXXXX XXXXXX XXXXXXX
XXXXXXX XXXXXX XXXXXXX
XXXXXXX XXXXXX XXXXXXX
XXXXXXX XXXYYY XXXXXXX

The YYY portion of the above bunch of letters is where the Item values in the Thank You & Rescue Mail is stored, So far from what we have gathered is that these passwords are not shuffled about randomly before or after encryption