FREE king size brand new memory foam mattress (Pawleys Island)

Zinus Pressure Rerlief 12” King Size Gel Memory Foam Mattress MUST PICK UP Purchased from Walmart $500 but is too large for the rental property bedroom Delivered last week.
Walmart offered free 90 returns but has now told me they can’t pick it up and I will be credited and can do what I want with the mattress.
We still have the box it arrived in, however memory foam mattresses come compressed and after you unroll it becomes a full king and obviously cannot still fit in box.
Can show the order and delivery date at pickup to prove it is brand new.
MUST PICK UP Sunday April 14th or Monday April 15th evening and a truck would be needed as the king size is 76”x80”