If they take the claws, they'll discover it has a secretion contained within when used to scratch or stab. Unfortunately, since there's no method of tanning the hide it will begin to decompose. Additionally, most of the creature seems to melt within a matter of hours when dead.

However, they can best make use of the body by observing the time between it dissolving and another creature appearing. They'll notice that for the period in which the body remains, roughly 2-3 hours or so, the creature will be absent. Once the body liquifies and sinks into the ground, another will begin to prowl the ceiling again within less than an hour. This may confirm that the rumors are correct regarding the creature's inability to die using conventional means.

If they want, they can use this information at any point in the future to consider methods to remove the creature for good, such as trapping it in a more permanent manner or killing it using a method that prevents the creature from easily reforming. This will be more difficult, but involving additional characters could improve their chances.

Successfully trapping the creature could allow the Lost to use it to their advantage later, if they want to take that risk.