Dead ones.
There was one live facehugger you see when they first enter the lab
In where? The labs? There weren't any eggs.
How are you sure, they never showed us everything in the lab, and all the facehuggers in jars had to have been extracted from the eggs, which means they must have brought some back.
Because we saw the egg chamber in the movie. Ripley was walking right through it. And she torched it when she left.
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Not all the eggs were in there, based on what I know, some aliens carry eggs throughout the hive to cover a broader range of the hive.