Amazon has the FJM Security Products 2-3/8 Triple Chrome Plated D-Shaped Security Padlock (SPSA60-KA) for $18 with free shipping on $25+ or with Prime.
Grease the interior so nothing important rusts. Old looking lock on the outside isn't necessarily a bad thing. Take the hint from TV shows, that if someone sees a shiny new lock on something, they know something valuable was recently put inside.
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Thank you!