I've never had this issue before:
-Not being able to retrieve Venom-X
Is that the actual Venom-X or ammo you're trying to pick up?
Cryptids getting stuck in the walls is usually only hunters and scorpions for me. I have never noticed a rhino or phantom, unfortunately. It could be helpful when with randoms and they aren't doing too great lol.
For me, this is the other way around - 4 escapes are added to POC when I complete Nightfall once:
-Point of contact escapes being added to Nightfall victories
As for it being unrealistic that the trophy can be found in a scavenge item, lets not get started on unreal-ism for the game. There's no other way to find them other wise, unless they make the packages bigger, but then people would see the item and not open it because they'd know exactly what it was from its size.
Few days ago we faced weird situation too. We destroy first hive inside the facility and then rhino came throught the wall where You can enter to breeder.We didnt go there because we thinked that would be cheating/boosting or something illegal. We did go there after last hive and got vicrory. I streamed that game and my friend took few screenshots, which i sent to activision and IW. And i also had thinked that trophy system.