Every bloodstock agent who participates as an agent in the purchase or sale of any race horse where any warranty of soundness, condition or racing ability is expressed or implied shall file with the Board within five days of the date of sale a memorandum report of warranty which shall set forth the warranties expressed or implied. In the absence of any such filing it shall be presumed that no warranties were expressed or implied by the seller. A memorandum report of warranty shall be signed by both seller and purchaser or by the bloodstock agents acting in their behalf.