Sorry about that. I did not receive any lump sum. I have the standard options setup and I received a (much smaller) equity grant that vests over 4 years starting at the date of the acquisition.
I have not been here 4 years, but that's the full amount assuming the current Amazon price. I don't have any strong opinion about where Amazon's price is headed.
A dead sibling comment claims that $0 is $0, which might be a relevant thing to say if I had not vested any shares yet.