The mattress was stolen from a house after the woman living there was raped by an intruder and before she had reported the attack to police.
The 23-year-old victim was sleeping in her bed when she was woken and subjected to a serious sex attack by an intruder who had entered her home
The incident took place at around midnight on Monday 15 October.
Before the woman reported the attack to police someone had entered her home and removed the king-sized mattress the following day.
Police are examining possible links to other intruder incidents in the area in recent days.