This is a universal poblem for vacation homes. My place used to be a summer "camp." I suspect that previous owners and guests used to just heave their empties into the woods behind the house. The woods have been gone for 30 years and I have been here over 10. I don't find a lot but every year there are shards that find there way to the surface due to freeze/thaw physics.
The best you can do is pick up what you can see and keep looking. Raking it periodicaly may speed things up.
Good luck!
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