Keep/Throw Away Original Parts After Service

In my search for vintage "serviced" omegas, I have come across a '75 moon watch that has had a full service. According to seller parts replaced: Mainspring, Chrono Switch, Setting Lever, Full Service, Two Crown Pushers, Crown and Crystal. I asked if the original parts will come with the watch and seller responded that watchmaker probably threw them in the garbage and that he never asked him for them. There is a receipt for all of the services performed, but I thought having the original parts would be an added bonus for selling purposes. Do you folks keep or throw away original parts after service? Is there any value in keeping the original parts?

Keep!!!

I like to keep the parts that have been replaced following servicing. I like to study the replaced parts under magnification in hopes of gaining knowledge as to how things mechanically fit together and operate.

The used crown and pushers are just about worthless. They have seals. They are meant to be used only once. After service you want/need your watch to be water/air tight. Using the old crown and or pushers won't facilitate this. Letting the elements into your movement isn't a good way to roll. One way to preserve the original crown and pushers is to not remove them when the watch is serviced and pressure test it.