Why can’t all stores have mascots as adorable as Steam’s?

I didn’t buy anything during the soon-to-be-over Steam sale (24-29 November), but that was no fault of the adorable mascots used to promote the sale. Here they are:

Onto the holidays!

A time to share with friends

I want that one!

Mascots seated at computers

Unfortunately, if we assume that there was a new picture every day, then that means there would have been six pictures overall – and I only have four. Does anyone know where the remaining pictures, if any, might be found?

ETA: Courtesy of Talorc at Quarter to Three, here are the remaining two:

Wishlist

For me, every Friday is black