Should I ask permission to go and pick up these airsoft bb's I left behind?

A long time ago maybe 10 or 11 years ago, my friends and I would have airsoft wars. Mostly on my property, but we once had it in a public field that is now gated off. If I see one laying around my house I'll pick it up but I don't go out of my way to look for them and pick them up. Should I go and ask permission to go inside this gated area and pick them up?
Should I ask permission to go and pick up these airsoft bb's I left behind?
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