...House should have given you the chip back. I did this a few days ago and IIRC you get the chip then give it to House who sends you to Fort Hill to activate the rest of the securitrons....
I have never had Benny taken by Caesar during a House playthrough, maybe it's a glitch? IIRC though I just talked to House and he gave me the chip (or even let me keep it, not sure I ever had it taken off me till I reached Caesar)
SPOILERS AHEAD, be careful what you read....
This is what I thought. I was so confused that I checked the wiki to see what I was missing. It says
'For part two of the quest, you must travel to Cottonwood Cove and take a raft to The Fort, where Mr. House's secure bunker is located. If you already collected the platinum chip, Mr. House will return it to you; if not, you'll need to get it back from Benny when you get there.' This has not happened, so when I access the bunker at The Fort, I have no way of activating the console by the hatch in the floor.

Possibly I have done some mutually exclusive things. I have -
- Informed the NCR that the Boomers will aid them in the upcoming battle.
- Resolved the quest 'How Little we Know' in favour of the Omertas (I don't know why I did this).
- Already given the chip to Mr House, and watch his Securitron upgrade in the basemant.
Also, Wild Card: Finishing Touch has not activated either, despite having made contact with all factions. When I speak to Yes Man, all I get is a dialogue to check out bunker at The Fort again, which we know that I can't do. :confused:
Is it a bug, or has the NCR/Boomer thing narrowed my path and blocked off the Yes Man/Mr House questlines?