Change of oil and found metallic spring etc inside - need your advise.

[andronikos916]

Hi guys, I need to add:

I checked the oil level before the oil change - maybe 2-3 days before. Car was cold on flat surface and the oil level was about 1" (2-3cm) above the maximum level.

Do you think that this hi oil level, maybe caused an excessive pressure and caused the damage?

Also the mechanic told me that he found these pieces on the magnet - I did not see them coming from my engine (I went for a soda that time). Maybe he accidentally placed the oil filter on a bench and the magnet picked these up...?
I am thinking all possible scenarios cause the guys from Performance Engineering saying:

"Hi Andronikos,
We believe the Backdraft's do not use and oil filter adapter, so that rules that out. I have talked to Eric and two other engine builders here, they all agree that all the parts found in the oil pan are not from any of the components inside the engine. All of our 408 Windsor Cobra Special engines do not have any check valves, like those parts found appear to be. Those parts possibly may be from a previous oil filter the original customer used. We suggest definitely switching over to the Ford Racing High Performance oil filter CM-6731-FL1A, after you that we don't seem why it wouldn't be ok to run your car. Your more than welcome to get a second opinion. Hope this helps".

My reply:
I just talked to the previous owner and he told be that he has never
used a different oil filter (Motorcraft FL300). As you can see from
the above image - there are no tiny parts in this filter.

What are these parts? Maybe do not belong to my car? That will be totally crazy? I am looking many hrs to find a similar metallic cup and I can not find any spare part that using that thing! So maybe it is not mine? And the dead psi oil gauge? Coincidence? ...

Thanx - Andronikos,