Looking for small lock box that can be secured, like strong handle etc?

It doesn't do me much good if the lock box is stolen; if could find one with a strong handle could attach to u-lock or similar to something secure. I like the shackle type like for keys if there was one much larger to store documents and the like, any ideas? Thanks!

Use something like this.

Attach strike plate to metal box with some Tamper-Resistant One-Way Round Head Screws

Or a Eyebolt. I would clean up the nut and the eyebolt threads with a wire brush. Then take it to a welder and have him weld nut to the eyebolt threads.

Here's a big one!

$573.19 Each Vertical Capacity 56,000 lbs

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This might work for you?
Portable Group Lockout Box, Yellow

My favorite easy to search web site on all of the internet.
https://www.mcmaster.com/
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I hate thieves.

I hadn't considered drilling the lock box; guess figured it'd be too strong; but from what I'm reading doesn't seem like it. Would I be able to use some Scotch-weld 3M DP 460 in the threads instead of welding?

For all questions about epoxy, I refer you to our beloved Doctorbass epoxy specialist.
DP-420 METAL EPOXY REVIEW by Doctorbass
[youtube]G6oLx4FjPVg[/youtube]
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DoctorBass Torque Arm
I assume you thinking to use epoxy on eyebolt nut? Yea it should be fine. Clean the metal real good like DoctorBass shows you how. Also glue nut to lock box.