A friend of mine worked 30+ years for the same company. Most of those years he worked a whole lot of overtime and kept two time cards. The first time card was the normal 40-hour week one, and the second was to log all the overtime. I mean lots and lots of overtime.
He had a verbal agreement with the two principals of the company that upon his retirement he would be awarded some kind of percentage of the company (?? he never explained it fully to me), kind of like Super Profit Sharing (??) and he once told me he anticipated something like a $500K lump sum payout from them when he retired.
Well, the principals of the company pulled out, sold out, one by one and the verbal agreement went out the door with them, along with all the mystery time cards. No half million dollar payout. All he walked away with was whatever he managed to stash in his 401K, and NO compensation for who knows how many thousands of hours of overtime.
He won't talk about it to me, maybe out of embarrassment and humiliation for falling for something like that - verbal agreements with employers.