Eurostar tickets for travel to France ?

I have 3 Eurostar tickets for travelling to Paris (Gare du nord) on Thursday, 23 August starting from London, St. Pancras and returning on Tuesday 28 August. Me and my friends cannot make this trip due to some unforeseen circumstances and would like to sell these three tickets. Each ticket costs 68 for the return journey and looks like a very good deal to me. These tickets are cheap since they were bought a long time back. Unfortunately, we cant make this trip and would like someone else to make use of these tickets and have some money back. Please do get in touch as soon as possible since the outward journey needs to made in a day from now. Cheers, Deepy