During the preparation and signing of the land plot sale and purchase agreement, it's crucial for it to encompass all accurate terms, especially concerning the land price. Other informal annotations or commitments hold no legal validity and cannot be considered. The seller intentionally avoids stating the true price to evade taxes and military contribution to the budget.
If the contract is annulled or deemed void, you will be refunded the amount stated in the transaction. However, justifying and reclaiming any funds that were transferred to fulfill the contract's conditions but were not explicitly outlined in the contract itself would necessitate substantiation and legal recourse.