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It looks like it came off the HPFP to me. Yes, they come off. You have to remove it when you are setting the clearance for the larger fuel pump lobe. A lash cap is required and to set the clearance correctly, theis spring has to be removed temporarily.
That spring is not from the HPFP.. your pic above of the HPFP is 'spring complete'
I can't tell you what that loose spring is though. If it's from an internal portion of the engine, then I wouldn't use it again per what has been iterated here... but it's also possible it's not from the internal of the engine since I'd expect it to be oil coated enough to prevent the pitting/rusting (unless it's been cleaned and then left to sit for notable amount of time). Perhaps it's from some external part, or depending on where you got your motor, maybe it's not even part of the actual engine and just some random spring that found it's way to your garage floor (shrug).
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