British Proof coin holders. Any ideas on finding replacements?

I've got some British commemorative proof coins from the 1970s, '80s, and '90s. They have little boxes, and COAs. They were passed down from my grandparents. My problem is that they have a plastic holder with sort of a rim around one edge, and some of the holders have been damaged. I guess they were dropped at some point. The coins are fine, and undamaged, but the plastic rims (not the holders) got broken. Does anyone know where I might find replacements?

I tried an e-mail to the Royal Mint, no response. I've check on all the usual sites, but these coins, being commemoratives, are sized differently that standard British coins, so no help. Any ideas?

Thanks!

 

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Pics needed please. Help us to help you!

 

I don't have a photo of the broken one, but this is another one I took photos of. Same size, same weight, but not a broken holder.

 

It's like an Air-tite holder, but they don't make one for this coin. 36.2 mm inside, 43 mm outside.

 

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