The most recent Marvel Snap patch saw the contents of the Collector’s Cache and Reserve (rewards for Collection Level 500 onwards) change to include Collector’s Tokens. In the process, a bug where opening them could cause them to be empty was reported by many players, unable to collect any rewards from them. According to the developers, players were not recommended to open the Caches while they deployed a fix:
The issue for this was promptly fixed on December 1 but by then a lot of players missed out on some rewards. To compensate, Marvel Snap has sent all players 200 Gold in their Inbox that you can claim for the next 2 weeks, and players who had the glitched Caches will be able to open them again:
Marvel Snap’s in-game Inbox can be found on the top right corner or the bottom right corner via the “News” icon.