Recycle bin fills up my ReadyNAS

I also have seen items remain undeleted in share Recycle Bins for long periods of time (much longer than the NAS share setting). For example, I recently undertook a reduction of files on certain NAS shares because these shares were being backed up to Readynas Vault, and were consuming too much space ($$) there. During this process, I discovered hundreds of files dating from almost a year ago sitting in the various cryptically named Recycle Bin subfolders. I have also done all of the things suggested above, so it appears there is some kind of script failure occurring and that I must manually clean out these old files. Is it safe to simply delete at will from the RECYCLER folder?