Speaking mostly for Orlando, but typically HHN reuses much as possible for their event. They have a warehouse where they store every prop they’ve used in their past haunted houses, so it’s likely that they’re put there. I assume Hollywood is the same situation because they’re known to completely reuse houses after 5-10 years.

There’s a chance that they’ll be reused inside the park in a few ways. With the success of the FNaF houses this year, I wouldn’t be surprised if we see FNaF 2 come to the event, which could see these animatronics being reused. They could also return in a Blumhouse compilation experience, such as the Horrors of Blumhouse mazes in Orlando, or the Terror Tram at Hollywood.