Whisky does not continue to mature once it is bottle and therefore would not gain value unless you found a collector that might be interested in the bottles. Otherwise, it is only worth what was paid for it. Sorry for not having better news.
You're welcome to post some photos of what you have here on the Whisky.com Forum to see if anyone has an interest. If you decide to do this, please let me know if you need assistance with the photos. Keep in mind you will have to register, but no worries there, it's a simple registration process.