Let's assume that Italy has just played Pact of Steel:
Pact of Steel wrote:
Use at any time. Germany must discard between 1 and 5 cards from its hand; then Italy may take the same number of random cards from its discard pile and place them on top of its draw deck.
and that Germany has discarded, say, 4 cards
At this point, the UK reveals Bletchley Park from hand:
Bletchley Park wrote:
Use when Germany or Italy uses a Bolster card. Discard 2 cards from your hand to negate the effect of the Bolster card (but not any cost associated with using the card).
Italy does not get to retrieve any cards from its discard pile. My question is: does Germany get its 4 cards back or are they lost (i.e. are they considered part of the cost for playing Pact of Steel?)