The Victorian branch of the Electrical Trades Union received the huge package of Sarah Henderson's official signage on Thursday afternoon and it's the biggest literal sign yet the election will be held on July 2.

"If we needed confirmation that the Liberals have already committed to calling a double dissolution election for 2 July – this is it," wrote the ETU State Secretary Troy Grant.

"1,000 corflute election signs for the Liberal's candidate for Corangamite, Sarah Henderson, have been mistakenly delivered to the ETU office in Geelong. Directly from Liberal Party Campaign Headquarters."