Greetings from the White House

There are many ways for the occupant of the White House to reach out to the American people or even foreign entities. The White House Christmas card is one way Administrations have been doing that since President Calvin Coolidege sent out the first Christmas message in 1927. It's been a White House tradition ever since.

Other ways the White House reaches out are printed souvenir cards with printed presidential signatures, invitations to receptions and dinners, autographed photos either hand signed or printed and then these curious items identified as a 'White House Greeting.'

In every collecting category there is always going to be the one thing or so that can't easily be explained. What is it? Where did it come from? How was it used? These 'White House Greetings' seem to fall into that category. They aren't Christmas messages since they aren't listed as such in 'Season's Greetings from the White House', the influential history of White House Christmas cards by Mary Evans Seely.

These greetings are from the Franklin Roosevelt Administration (the first image) and possibly FDR or Harry Truman (the second and third images); it's not later since the Truman Balcony hasn't yet been constructed as it would be in 1948. Is it possible the White House had at one point sent out something as innocuous as a 'White House Greeting' and then added a general or personalized sentiment that may predate the standard printed birthday, retirement or issue cards sent out today (JFK congratulatory printed message, fourth image)?

Any collector who might be aware of the significance of these White House Greetings, let us know in the comments.