What is Reddit's opinion of Master Lock Padlock, Solid Brass Lock, 3/4-Inch Body Width, 120T, Keyed alike, 2-Pack?
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2 reviews of this product found across Reddit:

Here's another link to a very reasonable seller of tamper-proof seals:

https://www.ebay.com/itm/SECURITY-SEALS-100-PIECES-EASY-BREAK-RED-with-WHITE-DISCOUNT-PRICED/271091844777?hash=item3f1e5546a9:g:xz4AAMXQRDxRFQe2

Regarding metal locks: I design and sell cages that come with metal internal cylinder locks (pics in post history). I've shipped a lot of cages, and I've never heard of one rusting. I have customers who've been using the same lock for over a year. Can't say it would never happen, but it seems like a low risk.

For padlocks, I've used these before and was happy with them: https://www.amazon.com/Master-Lock-120Q-Keyed-Alike-Padlocks/dp/B00004Y8D0?th=1

https://www.amazon.com/dp/B00004Y8D0/

If you're paranoid, toss one lock in the trash every month. At less than $2 per lock (4pack), that's not bad. And these are solid.

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