5 speed gearbox

For sale: 5spd gearbox. I had this standard gearbox professionally rebuilt as a spare box in case I had issues with my Colotti race box. However, this season I'm changing to a sequential box so the spare standard box is now of no use to me.
The box was stripped, inspected and rebuilt by Gloucester Road Gearboxes in Bristol replacing everything that showed any sign of wear, syncos, bearings, etc.
The gearbox has been used for a total of 4 events which equates to less than 30 miles and around 160 gear shifts in total. The box is ready to fit and is filled with new Redline MT90 oil with 0.5L top up oil.
I have attached photos and I have an in car video of the last time the gearbox was used in 2021 that I can show.
I'm based in Gloucestershire and I'm asking £500 which I think is a very fair price.