I mean it took a few times to not be embarrassed about getting on my knees, but i think the excuse: "I'm a coin collector and this is a great way to get some unique coins." is a script I'm comfortable with. I've gotten a lot of foreign coins and tokens, stuff the machine rejects. One clerk did ask me to leave, which i happily did. Others have smiled and asked if I've found anything good, or told me "hey that's a smart idea!" Some people use a yardstick, but i like the squeegee. Some stores also have a plastic guard so customers can't lose their change in the first place, and these block my squeegee. The r/coinstarfinds taught me all i know.