Canadian Club

You may or may not be familiar with the Canadian Club (Whiskey) Hide a
Case promotion. The company started the promotion in 1967, hiding cases
of their whiskey all around the world. Until 1983, they hid forty cases
in total. (They revamped the project in 2004 and this promotion was
reportedly pretty different from the first). Anyhow, there are allegedly
five cases that were never found---one in Ujiji, Tanzania, one on the
North Pole, one in Lake Placid, NY, one in the Yukon Territory and one on
Robinson Crusoe Island off of Chile. However, Canadian Club claims only 3
have never been found. Rumors exist that some were found and never
claimed or thatsome were never actually laid. Additionally, the actual
prize for finding a case was allegedly a worldwide adventure trip, $10,000
or simply the case of whiskey. Can you confirm or deny the reports of:
Which cases are still "at large"
What the prizes were
What cases were never actually hidden.
This is a fascinating little mystery and I thank you in advance for
looking into it, if it fits your criteria.