Fantastic BIts: Snaffle coords remains unchanged after scored

In Fantastic Bits contest, snaffle coords remain the same after it goes out of the field (scored).
So how could we know if a snaffle is still in the game or not ?

When a snaffle is outside of the field, you do not receive its coordinates. Be careful if you use an object / a map / a dict to store and update their coordinates.

thank you very much, i use an object indeed to store the snaffle.