I found a relay electrical devise [AC24V] on the floor next to my furnace. There are three others plugged in an electrical box on the furnace. What should I do?

Plug in relays on a furnace? Is this a warm air furnace or a hot water boiler? Does it work properly?

Some furnaces use a relay box for system operation, usually a white 3 part set. Mne is on the plenum casing.