The flexible opening can retain small items released from pockets or laundry during a cycle. Finding one there does not establish what may be elsewhere inside the machine.
Understanding this situation
After a completed cycle, check accessible folds only as the manual permits. Avoid reaching into hidden openings or removing retaining clips. Sharp items require particular care and should not be pulled blindly through rubber.
A useful next step
Prepare pockets before loading and keep small loose accessories out unless their washing method permits them. If an item is missing and a new noise has appeared, stop using the machine and explain the sequence instead of trying to retrieve it through the drum.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.