One pet I never received on live due to a bug (the dwemer spider from a public dungeon quest) does appear in my collection on Test. So, in that case, they didn't just translate stuff in my inventory to stuff in the collection. They obviously checked either the achievement or the quest completion.
That may mean that your mudcrab will reappear.
MSchroeder wrote: »We can confirm that YES, you will receive Pets and Mounts in your Collectibles menu based on the things you’ve done, not based on the items in your inventory or bank. For example, if you redeemed a code for a piglet pet, and then deleted the pet item, you will still have the piglet pet in your Collectibles window when Update 6 arrives. The same applies for Collectibles received from quests (such as Razak’s Opus), Loyalty Program pets (like the Ice Wraith), or any other source.
sparafucilsarwb17_ESO wrote: »MSchroeder wrote: »We can confirm that YES, you will receive Pets and Mounts in your Collectibles menu based on the things you’ve done, not based on the items in your inventory or bank. For example, if you redeemed a code for a piglet pet, and then deleted the pet item, you will still have the piglet pet in your Collectibles window when Update 6 arrives. The same applies for Collectibles received from quests (such as Razak’s Opus), Loyalty Program pets (like the Ice Wraith), or any other source.
Will this be account wide? Meaning that whatever I collected on one toon would be available on another?