Legendary items should be there as before the August update. No point to explore without the legendaries, game ends when all the rare items are collected. Making it feel like incomplete
Santa and elf added as a rare item in 1st October update but disappeared quickly. Now the skeleton and ghost also disappeared after Halloween.
5.2 25 explorers not enough.
5.3 Let players know how many items allowed, and make it work all the time. I sometimes have a hundred, some times less. Just got one forced recall with 86 items.