The court may examine upon oath any garnishee cited in to disclose as to whether, at the time of the service of the foreign attachment, he had effects of the defendant in his hands or was indebted to him, and may hear any other proper evidence respecting the same. If it appears that such garnishee had no effects of the defendant in his possession or was not indebted to him, he shall recover judgment for his costs; but, if it appears that such garnishee had in his possession effects of the defendant or was indebted to him, the court shall ascertain the amount, and the same shall, if the plaintiff recovers judgment and brings a scire facias against the garnishee, be prima facie evidence of the facts so found; but the defendant shall then have a right again to disclose on oath, and the parties may introduce any other proper testimony regarding such facts. If the plaintiff in such action by foreign attachment withdraws his suit or fails to recover judgment against the defendant, such garnishee shall be entitled to judgment for his costs.