help with value of my mega puss kitten please and ty

[anna Acanthus]

Well, you may have a really pretty kitty hidden in there but it can only carry traits that were new in the 2011 halloween collection which the Love Letters came from.
The only exception to this rule can be if an early LE package is sold unopend in which case the hidden traits will be the current ones as the hidden traits are only defined when the birthing box is first rezzed inworld. This obviously isn't the case as your kitty "shows" Coco 11 and not 111

As for the price that you can ask, the best way is to take some time to check over a few market sims and what kind of prices are happening, you'll see wildly different prices for more or less the same cat so it's best to plump for something in the middle .
As Megas are often sought for their looks and blueberry is pretty striking especially on Coco you might start a bit higher than you wish to sell then lower maybe if it stays on your hands for too long.

This thumb rule per trait is just about one of the silliest ideas anyone ever dreamed up and my advice is to ignore it, and i do wish people would stop parroting it all the time as some kind of established market rule, which it is certainly NOT; it can be totally misleading and contribute eventually to new trait market crashes.