Which preposition to use with anonymities

of Occurrences 2%

It is the anonymity of the struggle that makes it all seem distant and unrealtill the telegram comes from the War Office to say that the one among the millions who is dear to you is dead or wounded.

as Occurrences 1%

My pen was busy, and a second pamphlet, dealing with the Johannine gospel, was written and sent up to Mr. Scott under the same conditions of anonymity as before, for it was seen that my authorship could in nowise be suspected, and Mr. Scott paid me for my work.

for Occurrences 1%

Poor lion, who thought he had secured anonymity for his holiday!

Which preposition to use with  anonymities