"I do not see ours. Where is it?"

Translation: Īlvon urnion daor. Skoriot issa?

[con.brock]

issa > ilza?

[Joel__W]

Outside of the "there is..." construction, ilagon mainly means "to lie", so I'm not sure it would be used in a question like this. But it may well be.

[con.brock]

Sure. I guess I'd gotten the impression that sagon/ilagon represent a pair like Spanish ser/estar — but I acknowledge that could be a leap.

[MadLatinist]

I myself do not fully understand this yet, but apparently with skoriot, either sagon or ilagon may be used. See here for more.