Holiday Hoarders Guide (Item locations and Challenges)

The easiest way to do it is subduing both of them and hiding their bodies somewhere before they start, take the 12 items, then get guards to wake them both. Note that you must hold all 12 items in order for the "Santa's Little Helper" challenge to unlock (some of them are breakable if you throw them, so don't.)

Starting as Stage Crew gives you the possibility to quickly reach for the first burglar (He spawns on the first floor), then run to the underground floor for the second before he can start stealing the items, the Stage Crew outfit also gives you clearance to run around these areas.

After that, getting a Bodyguard outfit is prefered, considering some items are weapons and it allows access everywhere else you need.

1. Firework Remote (Stage Crew area on the table, 1st floor)
2. Circumcision Knife (Room with the lone Auction Staff, in a map box near the window, 1st floor)
3. Sabre (Attic nearby the security zone, 2nd floor)
4. Microphone (Attic in an intersection with 2 guards at the window, 2nd floor)
5. Cowboy Bust (Attic inside the "Attic" spawn location on a table, 2nd floor)
6. Bust (Attic nearby security zone on the table with the monitors, 2nd floor)

1. Coconut (Canteen, underground)
2. Apricot (Kitchen near the fireplace, underground)
3. Canon Ball (Museum near the stylist area on a table with a boat, ground floor)
4. Toy Tank (In the room with the blogger that needs the camera lens, next to the 2 stylists talking, ground floor)
5. Battle Axe (On the big table at the party, ground floor)
6. Shuriken (In the hallway near the tech crew guy talking to the model, on a cloth rack, ground floor)

Once you collect the 12th item, you'll get the "Santa's Little Helper" challenge.

In order to get the "Ho Ho Ho" challenge, you should prepare the Santa outfit before waking them up, so you are ready once they go downstairs. You should also prepare the propane tank (in order to get the accident kills easily). There are two propane tanks in the room on the left of the burglar's final room.

Get guards to wake them up (the timing does not matter anymore in this version, if one of them gets there first, he will simply wait, just do not get seen by him and wait for his friend).

Once both of them are back in the room, wait for them to properly meet (they'll do a little animation and sound disappointed) then simply place or throw the propane inbetween them and shoot it while wearing the Santa 47 disguise, that should take care of the "Ho Ho Ho" and "Oh Deer" challenges.

The 4th and last challenge, "Bad 47", is easily doable by opening the gift inside the underground security room, as it will contain 3 bricks inside.

Just pick them up, go stun Marv with one, get a guard to wake him up and repeat.

Doing all this will unlock the Santa 47 disguise to wear in Hitman 2 levels.