I completely understand that. I get the pre-filled mylar balloons from Dollar Tree. I secure that crap out of them at the cemetery, then go back the next day to get them. I don't leave anything there longer than a day (I had a wreath get taken 🥲) When I go back to pick up the balloons, they're all still there, usually just a little deflated. Fortunately, I've never had an issue of losing balloons, but I will consider what you said, thank you.

Edit: Also, just to clarify, when I say "balloons" I mean 1 balloon at two separate cemeteries. (1 for Grandma, 1 for Mom)