19 CFR §165.12

1. (a)Date of receipt. The “date of receipt” of a properly filed allegation is the date on which CBP provides an acknowledgment of receipt of an allegation containing all the information and certifications required in § 165.11, together with a CBP-assigned control number, to the party that filed the allegation. CBP has 15 business days from the date of receipt to determine whether to initiate an investigation under the EAPA.
2. (b)Withdrawal. An allegation may be withdrawn by the party that filed it if that party submits a request to withdraw the allegation to the designated email address specified by CBP or through any other method approved or designated by CBP.