Honestly, I’d approach this in layers rather than trying to “booby-trap” the bins. Start with access: ask your property manager or city waste department about lockable lids, heavy-duty latches, or an enclosed dumpster pad. If the bins are shared, make sure everyone can still use them and that collection crews can open them safely—never chain a bin shut in a way that blocks service or emergency access.
Reduce temptation by keeping deposit-return containers and easy-to-resell items out of the main bin. Store them separately if you want to donate them, and shred sensitive mail. Put bins behind a gate or in a well-lit, visible spot, and keep the area clean so it doesn’t look like an easy scavenging stop. More frequent pickups and smaller, better-managed waste volumes help too.
Add clear signs like “No scavenging—secured waste area,” but don’t rely on signs alone. If this is happening repeatedly, loop in your city’s waste enforcement, business improvement district, or community police officer; they can advise on local rules, cameras, or access-controlled enclosures. And if people are digging for food or recyclables, consider connecting with local outreach or recycling programs—that’s often more effective and humane than confrontation.
Avoid chemicals, traps, or illegal locks; they create liability and can hurt sanitation workers. The best combo is usually secured bins, less valuable waste, good lighting, regular pickup, and a coordinated community response.