Leave it there for a fortnight Rogan.
Often when ppl are selling peat, they just check to make sure there are eggs there and sell it as a fortnights collection.
You will know if they are using the peat as it will appear all over the tank as the fish dive into it to do their thing..
Stu recommends that gravel be used as well as the peat, as in their excitment, much "pressing" is done outside of the pot, on the gravel.
Treat this as a bonus, but when syphoned out, you will have "clean" eggs, and know exactly how many you have.