Your daughter’s father can visit a local USCIS office to request his alien number. Alternatively, he can file a FOIA request with USCIS to access his immigration file, which includes the alien number. Applying for his replacement resident card without the alien number may result in rejection or denial by USCIS.USCIS requires complete and accurate information for all applications. To avoid delays or rejection, having all the required details is essential before resubmitting the application. Good luck! For further guidance on FOIA requests or replacement green cards, contact us for help today!