Looking on the Minipet thread, all the white 5th minis are 35-60k, and the rest are 50k-80e.
How much is the present worth wrapped... and would you advise me to open it or sell it?
If I get a mini, whatever colour, I'm probably going to sell it in order to buy 1st-4th minis that I'm missing.
That thread is awfully outdated. Whites from 5th year are nearing 20-25k, and 5th year presents are usually sold @5e. Any purple, golden or green pet would exceed that ptice but getting a white one is more likely, so it's up to you if you open it or sell it