Quote: Yes, there should be two plugs. I used tape for awhile to cover the hole to bring up the humidity - but it is better to leave them open as the chicks/eggs do need more air.
That is a very nice incubator, looks nice and clean. You will need to attach the "wafer" into the area to the left of the picture - where the yellow box is. There should also be a screw that goes thru the top to put it on. Without the wafer you will not be able to regulate the temperature.
You appear to have two broken trays - you can take them out and not use them until you get replacement trays. They are missing/broken where they would attach to the turner. The other possibility is they are in backwards - check the other end for the "arm"
The clip you showed is a paperclip - mine uses what look like cotter pin clips, straight wire goes thru the hole in the arm and an outer curvey wire to clip around the plastic.
Nice find!
P.S. - Ron's link lead me to find the turner parts:
https://www.gqfmfg.com/store/comersus_listItems.asp?idCategory=50&orderBy=sku but you can use the paperclips like Deb said.