Oscar Wilde? Stuart Mason? Christopher Sclater Millard? Robert Ross? Elizabeth P. O’Connor? Arthur Ransome? Frank Harris? Sylvestre Dorian? Apocryphal?

Question for Quote Investigator: According to legend, the famous wit Oscar Wilde delivered a comically audacious line when he first entered the United States during his lecture tour. A customs official in New York asked him if he had anything to declare, and he supposedly replied:
I have nothing to declare but my genius.
Would you please explore the provenance of this remark?
Reply from Quote Investigator: Oscar Wilde entered New York in January 1882. Yet, the earliest evidence of the quip known to QI appeared in 1910. The phrasing has varied over time. Often it has been presented from a third person perspective. Here is a summary with dates:
1910: I have nothing to declare except my genius
1912: He had nothing to declare except his genius
1912: He had nothing to declare but his genius
1913: I have nothing to declare but my genius
1917: He had nothing to declare save his genius
1917: He had nothing to declare but genius
1918: Nothing—except—my genius
1923: Only my genius
1925: Nothing but my genius
1934: I have nothing but my genius to declare
The remark appeared within “The Oscar Wilde Calendar” of 1910 compiled by Stuart Mason, a pseudonym for Christopher Sclater Millard. For each day of the year a quotation ascribed to Wilde was presented, and the following appeared for January 4th. Boldface added to excerpts by QI:1
At the New York Custom House: “I have nothing to declare except my genius.”
Millard mentioned Robert Ross in the acknowledgement section of the calendar. Ross was a close friend and literary executor of Wilde. He may have supplied the quotation to Millard:2
Many quotations are made from works little known to the general reader. Some are taken from unpublished manuscripts, others are traditional. For many of the latter the compiler is indebted to the courtesy of Mr Robert Ross.
Below are additional selected citations in chronological order.
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