Anyone have good luck with the USPS finding their lost auto parts in the system?

My latest purchase for some parts has also come back to bite me in the ***.
Wondering if anyone out there has filed a search with the USPS, and has good or bad luck, with them finding the parts.
Here's what's now going on.
I purchased a pair of calipers from a guy in Georgia.
Packaged them up in a large, USPS flat rate box.
Evidently the calipers were recent take off's from the donor car.
Somewhere in transit the box must have really been tossed around.
I think upside down, as all the brake fluid that was still in the calipers, leaked out, and soaked the box with brake fluid,
and contaminated the box, making the cardboard soft, and weak, causing the calipers to fall out.
All that i got from the USPS from the West Sacramento, distribution center, is the contaminated, brake soaked, shipping label that was on the box.
NO CALIPERS.
Filed a claim for lost items, but they naturally can't tell me where in the system, the calipers came out of the box.
I'm wondering if the box had the calipers in it, since what was left of it, must have got to the West Sacramento, distribution center.
Do you think i just have to chalk this up to a loss, or keep my fingers crossed that they can find the parts?
I really can't blame the USPS, as it's not their fault in the improper packaging.
The package was not insured for any loss or damage.
Who woulda thunk it, that residue brake fluid in the calipers would leak out.
Well thank's for reading, and possibly your thoughts.
Jim V.
hemi71x