If you have any additional questions, please contact the OTS directly at the phone number that corresponds with the event in the Speed Duel Release Celebration Locator page
Also, there is always the risk of counterfeit or tampered cards
Even with as low as five imprint targets I still find Chrome Mox to be quite reasonable in the deck
So far in 2020, we've been averaging about one per month (and if you go back to the initial release in December, we've actually had 13 individual drops in three months, making the average closer to four drops per month since the series was announced), although the average is somewhat complicated by how you count themes that come with multiple drops, like the original Theros Gods during Worlds in February (technically, the Gods were five individual but related drops, although there is an argument for counting them as one big drop since buying all of the drops together was an option)
So, there is a .02% chance of earning a PSA 10 if submitting an OPC Gretzky rookie to PSA