Well done! If you can use eBay to advertise the pin and arrange to do the deal off eBay then that's ideal. Problem is its very tricky to exchange contact details when they start blocking messages.
Yeah there's ways around it. I haven't done this but I often see sellers posting a photo of their phone number for instance. I'm not quite sure what keywords trigger them to censor/block messages but you just have to be careful with wording. I directed one eBay buyer over to Pinballinfo to continue the conversation. I think it's when you type phone numbers that eBay gets alerted. Although it seems to be luck of the draw.