It's apparently a concern for at least one other person here, I would be remiss to not consider the possibility even if I believe it unlikely.

[They hadn't come across any monsters intelligent enough to try that yet. Or even had it hinted at. But it wasn't beyond the realm of possibility..]

As long as there's a cohesive theme, multiple options are also fine. Coaxing every new arrival to recall that this bracelet, that jersey, this pair of shoes and that set of dog tags all signify the same thing, with other variants inbetween, may muddy the waters.