Changed by the routines at 7603 and 7996, and checked by the routines at 7500 (using the event entries at 600A and 6097) and 7A39. Each bit set here corresponds to a key in Sam's possession.

Bit(s)	Key
0-2	Unused
3	No. 74
4	No. 31
5	No. 27
6	No. 15
7	No. 19