OP, I've spotted your auction is far under the Bitcoin price at present so I assume you're not going to accept anything less than face value?
If it does sell for less, which is very unlikely in the current climate but you never know, then you may as well tell the winner to sod off and peel it and sell the Bitcoin and alts off it which will be far less hassle and more secure for you, or offer it up here instead to rescue it.
If it were me I'd only do the sale meeting in a bank and accepting cash or bank transfer straight from them to you. And once again balls to Paypal and triply even more so if a deal is done in person.
For reference OP the current price of Bitcoin (not including Bitcoin gold or cash) is £11k - your auction is currently at £6k
Also as you're not so savvy with Bitcoin, it seems like cash / bank transfer is a better route for you. If you go down this route I would definitely suggest meeting in a bank or police station in case the buyer wants to do anything he shouldn't..
Regardless well done for holding on to the coin so long - it might be a little difficult to shift the coin right now due to the constant rising price of Bitcoin - if you do find a buyer make sure you do you due dil with them first, don't rush into a deal you're not comfortable with