It says SC on the connectors in the picture, so one would assume that they are SC connectors...

Edit: They seem to be Corning Anaerobic Connector, SC, 62.5 µm multimode (OM1) and the boxes you ordered are for 50/125µm or 2.5/125µm. I don't know if that matters, but it may be why they don't fit properly. Well, looking at the frequently bought together, they list a 62.5/125µm patch cable so maybe not... Unless 2.5/125µm is a typo and it should be 62.5/125µm.