Poker@Bellagioresort.com ... 702-693-7291 ...
1) Did you get the name of the original staff member?
2) Hopefully you went to security/surveillance, not 'lost and found' and filed an official claim request. Most staff will not make this easy or even suggest it as it creates work on their end unless you were very adamant about it the first time around.
3) Typically lost items, considered 'abandoned property' in casino terms, has a timeline in which it must be claimed. Hopefully this timeline has not past.
4) Did you wire money into the casino originally? This may or may not give them a path to return the cash to you.
5) With you being 'far away' properly identifying you may be an issue.
6) Unfortunately you may not get the full effort of staff unless you are actually standing right in front of them.
Sometimes we lose our chips/cash, but we want to lose them on our own terms. Hopefully you can find some sort of closure ... GL