Ryzen 9 5900x

Location: Greater London - Feltham
Swap Value: £300-£400

Description:

Ryzen 9 5900x Processor(12C/24T, 70MB Cache, up to 4.8 GHz Max Boost)
I bought this on the 1st of march (Have the receipt/invoice) Used only once and still in new condition.

I want to swap for

Ryzen 7 5800x3d