~$30k Pokmon card package stolen by USPS employee

Hi, posting here for legal guidance.

I shipped a Pokémon card collection worth about $30,000 USD through USPS to PSA for grading. The cards were stolen, and one of the cards was later found in possession of a USPS employee. He told a police officer that his boss (a higher-up at USPS) sold that specific card to him.

Right now, that single card is the only one I’ve been able to locate from the shipment. He still refuses to return it to me. He is local to me Location: Indiana, where I shipped them from.

I have the tracking number and timestamped photos of the cards.

I’m trying to understand what my next steps should be and how situations like this are handled when USPS employees are involved.

If anyone here has experience helping recover stolen collectibles or handling situations like this, I would be sincerely grateful and would consider it my obligation to fairly compensate anyone who plays a direct role in helping.

Original background post:

https://www.reddit.com/r/pokemoncardcollectors/s/YKsFHU7Vkr

Author: cosmicturnip