Theft of personal items

We have had timeshare at this resort for over 30 years and our guests with us at the time inadvertently left an expensive knife set in the dishwasher. I was kindly assisted by a lady house-keeper whose name I cannot recall and she agreed to keep them in safe-keeping until I could arrange collection. I have another guest going there next month who is able to collect them an return them to me - after sending an enquiry to ensure this is done, I received an e-mail telling me for the first time today, that after 3 months any items are DONATED!!! This is THEFT. Whatever belongs to somebody else is not automatically an entitlement to thieves. I am so furious and horrified!!!