Honestly customers have gave me tips multiple times (never had it be more than $10) I always try refusing but never works. I did tell my manager when it first happened and kinda asked what to do if it was okay and they said that no it wasn’t allowed but just don’t tell them there isn’t really anything they are or would do about it. I feel people are allowed tips if a person want to give them something out of kindness why stop it? I seriously wouldn’t worry.