#1
At work typing this on my phone so I dunno if it'll work right. Somewhat of a test of my inproductivity, if I may be so bold as to invent words.

I once met an old prospector

I brought him a clock
I'd crushed with my bare hands
He sifted through the shards and sands
And didn't even find a minute speck of gold
#2
I think this exemplifies the feeling very well. I really can't think of much useful to say about it
#3
I'd change the last line to "And didn't find a single speck of gold". And I'd make it longer, although I must say this has its own little charm.
#4
but then you lose the word play. I thought this was alright but you've done better little things like this. I'd consider dropping "even" if anything.
Anatomy Anatomy
Whale Blue Review

Park that car
Drop that phone
Sleep on the floor
Dream about me