Need some suggestions people. Help! Options

[Kyrel]

Guys (and girls?),

The group I'm playing with and I have taken on a run thrown at us by our GM, and I/we could use some suggestions on how to complete it.

Group: (425BP at creation, 30Karma earned since beginning of the game)
Agent (me) - Sammy, light hacking skills. Pistols and melee man. Ex-FBI man, megacorp investigation division. Contacts: FBI, Seattle Branch; Ex-wife, megacorp secretary, Ares corp.; Fixer, well-connected but low loyalty; ID manufacturer.
Twister - Streetmage. Decent mage. No Matrix ability at all. Light combat ability.
Wolf - Rigger/Hacker. Super focused Hacker. Crappy fighting/physical skills.
Oni - Adept Face. Super focused Face, light fighting ability.

Mission:
Replace a mingvase with a replica without anyone realising it.

Target area:
High security appartment complex for very rich people. Penthouse appartment with butler. Butler might or might not be present during the run. Butler has unknown abilities. Owner is a middleage millionaire (or richer). Owner is expected to be partying elsewhere during the run. Knights Errants are responsible for the security in the building. In-house Spider/Hacker. Elemental guardians, triggers unknown. Security cams running in cooperation with pressure sensors in the floors. Alarm goes off it you have pressure activation, but no visuals of the cause. Security guards aplenty in the building. Visual inspection upon entry and cross checking of ID against inhabitant/guest list. Sentry guns on the roof. High security area. Appartment will have the building security, and (might) have additional internal security as well. There will be other parties going on in the building during the time for the intended run.
It's currently evening December 28th, and the run is scheduled to go down either during New Years Eve, or the day after. Window of opportunity remains open for 1 week after New Year.

Our hacker has managed to gain complete access to the building's matrix/computer based security, and he can get us inside the building by adding us to the guest lists. We can probably get an invitation to one of the parties in the building as well. Getting us to the penthouse should also be possible for our Hacker. We do not currently know what additional security the appartment might have inside though, and it is unlikely that we can gain access to it, without having the hacker be there in person (and he stands out in the kind of crowd that lives in that place). Our face might be able to seduce the owner.

The pay for the job is 50K per group member (200K total).

Here's the question I/we could use some suggestions on: How the HELL do we pull off this run without anyone noticing the switch has take place??? Suggestions please.