The Original Boston Cream Pie...

...Probably didn't look like this one. But this Pie was purchased at the origin point of the Boston Cream Pie, the Parker House Hotel in Boston. If you are in town, swing by for Pie. But don't eat there unless you like paying $60 for a terrible meal. My chicken was woefully overcooked, and my mom's fried fish mournfully soggy. Even the famous Boston Cream Pie seems to have undergone some sort of morbid modernization. The Pie itself was good enough, but that was definitely redi-whip on the side.

You may be better off saving yourself the trip and baking The Pie from scratch using Parker House's recipe.

A bit more on Boston Cream Pie from Foodtimeline.org:

"

Boston cream pie. A pie made of white cake and custard filling or topping. If chocolate icing is added, it is called "Parker House chocolate pie," after the Parker House in Boston, Massachusetts, where the embellishment was first contrived. The pie goes back to early American history, when it was sometimes called "Pudding-cake pie," or, when made with a raspberry jelly filling, "Mrs. Washington's pie," The first mention of the dessert as "Boston cream pie" was in the New York Herald in 1855."

Although it was dubbed "Boston Cream Pie" in 1855, I don't believe that it was The Pie as we know it. The chocolatey custard dessert has more of a late 19th c flavor profile. But I would say it warrants more research at a future date.