Could it have been bringing it in but not in volume? If this was a new hive with no comb maybe there was no room for pollen?
I have very little experience... this is our first year. But when we looked Sunday there was zero pollen in the drawn comb. And no eggs. No pollen observed going into the hive between Wednesday and Sunday, but obviously we are only watching for a brief time.
I have yet to have a hive build comb (except for queen cells) without a queen and have yet to have a hive haul pollen without eggs being laid. The queenless hives and swarm I've dealt with have just spit little globs of wax all over the place, but with no structure to them. I added a bar of brood to anchor the swarm and when I opened it up a few days later they had started several queen cells, spit globs of wax all over, and started haulling pollen. The day after we introduced the mated queen they had started comb on two bars.
They will haul pollen as long as their is brood in any stage (it seems), and they will build comb as long as there is a queen.
The first package we installed sat and did nothing until they got their first queen. Then they drew comb quickly and she began laying and bees began bringing in pollen. Then they went queenless again. Comb building completely stopped, but they have continued to haul pollen as long as their was brood in the hive. I also put a mated queen in this same hive after feeding it eggs and emerging brood to keep it going. I did this on a Thursday evening. Guess what they'd done on Friday evening when I went to check on the queen cage (through observation window)? They'd build another good chunk of comb.
I'm not saying it's a hard and fast rule, but I'd put significant money on their now being eggs in the comb of the hive that we noticed was now hauling pollen yesterday.