I've been offered a couple of boxes of .303 ammo, neither the seller nor I know what they're worth. The first is a cardboard container marked: 48 RDS .303 INCH L1A1 HXP 11-87-02 (the 02 is underlined). The second is a sealed metal box marked: 300 CTGS, CAL .303", BALL MK 7Z, 5 RD Clips, Bandolers, LOT 40 HXP-75. I want to offer him a fair price, but don't want to over pay. Any help would be appreciated.