Yes, the Lao eVisa sticker is smaller than the regular Lao Visa sticker, but Lao eVisa price is about USD $52.-
And, of course, you still have to queue separately for the Lao eVisa sticker upon arrival and only able to enter Laos at 3 Land Border Gates along the Lao-Thai Border, or 2 Lao Airports with direct flights with Thailand that accept Lao eVisa.
when Lao Immigration accepts payment for the Lao VoA in Thai Baht instead of USD Dollars, then it will be at a 'very bad exchange rate'. Hence, the Baht price will not be the equivalent price of USD $40.- This has always been the case with the old prices for Lao VoA (was varied, depending on passport country). Pay in crisp, new, clean US Dollar banknotes for Lao VoA of USD $40.-
try including a copy of your Australia Post Mail Redirection Application form (date stamped) + Receipt, which would show your 'official' change of address from old to new addresses