如果没有放在劳动局统一保管的凭证或经办人证明只能补档。
1、去档案凳纯馆查找入厂凭证，因为20年前人员调配仍属于计划分配，工人参加工作均有劳动局调入手续，一般在档案馆可以找到；
2、在原工作单位查找每年的原始凭证，如录用毁悔手续、工资表、工人名册等等；并由用人单位出证；
3、去下放地查询所有纤粗正有效凭据，并由下放地管理部门出具证明；
4、携带户口本、身份证及各种查询到的相关资料去劳动局认定就行了；
临办理补档前最好先咨询劳动部门需要补档所需要的资料，防止走弯路。
供你参考
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