Here are the odds:
99% probability of getting at least one albino in the first 7 babies if one of these is bred to an albino. This could require one or two clutches of eggs.
99% probability of getting at least one albino in the first 17 babies if one of these is bred to a known het albino or if these two are bred together. This may take three clutches of eggs.
If a possible het albino produces an albino baby in one of the above tests, then you are certain that the possible het is a het.
If a possible het albino goes through one of the above tests without producing an albino baby, then the odds are 99% that the possible het is a normal. There is no way to be 100% certain that it is a normal. But if I resold it, I would sell it as a normal.