Since you ordered a hybrid musk, I'm thinking your rose is Lavendar Lassie.

I'm not sure it's LL. The leaves seem smaller and the plant habit, so far, is low-growing. Blooms are also small - just over an inch across.

I was also sent Verdi by mistake (pictured below) and I thought mystery rose above might be another Verdi. However, I'm not sure the one labeled Verdi is Verdi either!

Your first rose doesn't look like The Fairy to me. The blooms look too relaxed, almost just semi-double.

The blooms are too pink to be the fairy... it reminds me of China Doll

Definitely does not look like my Fairy's.

Well, several weeks later, 'Not Ballerina' seems to grow in a more upright manner - not spreading as the first several months.

The plant has one cane reaching into a neighboring rose (almost 3' tall). Blooms are light pink and in clusters.
Any ideas as to its true identity?

Not sure of its true identity, but I would also agree that it is not The Fairy.

Absolutely not Lavender Lassie. That is for sure.
I think it can be Gartendirektor Otto Linne
http://www.helpmefind.com/rose/l.php?i=A2909&tab=10
Olga

Thank you Olga!! The photos look very much like the rose I've got. Mine has long arching canes with big clusters of blooms. I'm glad to stop calling this rose 'Not Ballerina'!

Anne