Museum curators are appealing for people who left family treasures for valuation, to come and pick them up.
More than 500 items, from Box brownies, to rusty old swords, are still awaiting collection at Wardown Park Museum, some from as far back as the 1940s.
The items are not ones that have been donated or loaned to the museum, but which have been left, sometimes for a valuation or simply for families hoping to find out what it is.
But the museum is running out of space, and as it digitises its million plus items, it needs to clear out those which do not fit in with its collections of the local history of Luton and Bedfordshire.
Time is running out for people to collect their goods,. The museum is trying to contact names left on the forms with the items but in many cases is coming up blank.
“These are not loans or donations,” said Tim Vickers, collections care officer.
“Some of them are going back to the 1940s so they could be items left by grandparents.”
Each item is carefully kept with attached paperwork for a name and contact details.
Museum staff have been trying to contact owners but so far with little success.
And if the items are not collected by August 3 this year the museum can sell them or donate them to charities.
Mr Vickers is urging anyone who knows they have left belongings with the museum or who comes across paperwork left with relatives to get in touch.
>He can be contacted on 01582 547969.