Total Possible Garbage: Missing mystery-Jack-o-lantern

Sorry having trouble following your question. If you only need one thing out of the possible prizes and you buy a pumpkin you'll get that prize. I was in this exact situation and was only missing the Sepulchre, bought the pumpkin and got the Sepulchre.

Edit: And if your asking about odds, these things are usually coded with varying probabilities. So my guess is the Sepulchre is relatively low probability compared to other less desirable prizes like the hovercopter.