Unless your animal looks Pinstripe, he is not carrying the Pinstripe gene. Pinstripe is an incomplete dominant gene and is either there or its not.
Candy and Albino are compatible recessive genes - the combination of the two gives you a Candino. From the pairing you shared, the breeder had the following offspring as possibilities:
- 25% Candino
- 25% Albino
- 25% Pinstripe Candino
- 25% Pinstripe Albino
It would take a keen eye to differentiate between the Candino offspring and the Albino offspring, but if the breeder feels confident is saying he's an Albino, that's what he likely is. He wouldn't be het for anything else since there's nothing to be het for in this pairing.